jaxws/src/share/classes/com/sun/tools/internal/txw2/model/CycleIterator.java

/*
 * Copyright 2006 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

package com.sun.tools.internal.txw2.model;

import java.util.Iterator;

/**
 * @author Kohsuke Kawaguchi
 */
final class CycleIterator implements Iterator<Leaf> {
    private Leaf start;
    private Leaf current;
    private boolean hasNext = true;

    public CycleIterator(Leaf start) {
        assert start!=null;
        this.start = start;
        this.current = start;
    }

    public boolean hasNext() {
        return hasNext;
    }

    public Leaf next() {
        Leaf last = current;
        current = current.getNext();
        if(current==start)
            hasNext = false;

        return last;
    }

    public void remove() {
        throw new UnsupportedOperationException();
    }
}